I read up on these lifters. They are typical new gen lifters with edm oil feeds directly to the axle wheel and pushrods feeds.
That combined with a .650 lift cam may be trouble. I am running the comp cams version of this same type of lifter. I had my lifter bores bushed. The bushings have a .030 feed hole to restrict flow and keep the oil pressure up. With that big of a cam and the necessary spring pressure to go with it, if you were ever to break a pushrod and the lifter was thrown out of the bore, you will lose all oil pressure. IMHO
Plenty of threads on the board right now of guys running rollers without tubing or bushing the lifter bores and have low oil pressure.
I would hate to see you hurt that new motor. Just an FYI